MSHA - Code of Federal Regulations - 30 CFR 57.12020
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MSHA - Title 30 CFR
30 CFR § 57.12020
Protection of persons at switchgear.

Dry wooden platforms, insulating mats, or other electrically-nonconductive material shall be kept in place at all switchboards and power-control switches where shock hazards exist. However, metal plates on which a person normally would stand and which are kept at the same potential as the grounded, metal, non-current-carrying parts of the power switches to be operated may be used.

For more information: See MSHA'S Program Policy Manual